Mechanical power



(No Model.) 1 l 2 SheetsSheetl W. S. GRAY. y MEGHANIGALPOWBR. y

No. 297,595. Patented 91,1929, 1884.V

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(No Model.) 2 Sheets-Sheet .2.

W. SQIGRA'Y.; MECHANICAL POWER.

UNITED STATES PATENT OFFICE.,

WILLIAM SMITH GRAY, or MAY, TExAs.

MECHANICAL PowER.`

SPECIFICATION forming part of Letters Patent No. 297,595, dated April 29, 1884.

Application filed Fcbruary, 1884. (No model.)

To all whom it may concern: Y

Be it known that I, WILLIAM SMITH GRAY, a citizen of the United States, residing at May, in the county of Brown and State of Texas; have invented a new and useful Mechanical Power, of which the following is a specification, reference being had to the accompanying drawings.

Figure 1 is a view in perspective of a machine embodying my improvements. Fig. 2 vis aview of the machine when used as a stumppuller, mounted on a farm-wagon ready to be transported'from place to place. Fig. 3 is a view of the machine removed from its frame, and provided wit-h abas'e and top bar, whereby it is converted into a simple hoisting-mal drawings, a designates the main or center bar of the machine, to thelower end of which is piv` oted the cross-head b, provided with sockets c c, for the reception of the removable wooden levers d d. rlhese wooden levers d d are perforated in their upper edges at d', and are provided with pins d?, secured thereto by chains d3, to prevent them from being lost. These pins are employed to hold the wooden levers in place in their sockets. mayvaryinlengthinorderto varythe power according to the requirements when the machine is used. The cross-head b has spaces e e, in which the lifting-pawls ff,with their handles f f', are fulcrumed, the handles extending vabove the cross-head and the lifting-pawlsf']c below the same. The lifting-pawls f f are rectangular in form and engage the teeth g on the inner edges ofy the rack-bars 71. h. The rack-bars h h are connected at their lower ends by the parallel barst' i, secured thereto by pivot-bolts fi', and they carry between them the pivoted eye i2, to which the log-chain is to be attached when the machine is to be used as a Vbars h h.

two parallel arms, ZZ, rigidly secured to the The wooden levers stump-puller. The upperjends of the rackbars h h are also provided with pivot-bolts i', byv which parallel bars i i may be secured thereto when the machine is to be used as a simple hoisting-machine.

A short distance above the cross-headb are I the check-pawls or holding-pawls k k', which are pivoted to the center bar, a, and normally engagethe teeth in the outer edges of the rack- Jabove these holding-pawls k lc are center bar, a, and provided near each end with swinging hooks a n, to hold the check-pawls 7c k up out of engagement with the rack-bars h h when it is desired to lower the rack-bars h h to begin the pull.

Where the machine is to be used for pulling stumps, it is mounted on a portable derrick, p, that may be either drawn on runners as a sled or mounted on the holsters-of a farm-wagon, in the following manner: The machine is suspended from the top of the derrick p by a pivotal connection, as at q, the derrick being suitably braced, as at I'. .The four posts rl are each provided with a perforated stirrup, s, on their outer sides, and the posts also have holes aligned with the perforations in the stirrups s. Four levers, s, are fulcrumed to clipss?, and connected by chains s3 through their ends to bails pivoted to the ends ofthe runners. These levers s are also provided each with a chain,

4, having a pin at its end to secure the lever in its stirrup, To support the frame or derrick p on the wagon, the clips s2 are placed over the wagon-bolsters or over false bolsters, and secured by pins. The power ends of the levers s are then pressed down into their respective'stirrups to raise the derrick from the ground, and the pins inserted into the proper perforatious to hold it in the elevated position. It may then be transported to the next stump and let down upon the groundfor use. The wooden lifting-levers operatethe liftingpawls alternately, and thereby raise the rackbars hv h alternately, and the holding-pawls engage the outer teeth of the rack-bars and hold them until the nextv lift on the bars, when IOO a hoisting-machine-that is, where it is to be placed under an article to lift it-it is removed from the derrick and the center bar is provided with a base, a, and a cross-head, fr, is to be provided at the upper ends of the rackbars h h, as shown. In other respects the machine is the same as that hereinbefore described. \Vhen used as a stump-puller, it should be replaced in its derrick, the eye w and key .t being employed to secure it in place. A machine of this construction possesses great strength and an immense amount of power can be applied through it, enabling two men to remove the largest stumps and to hoist heavy articles with comparative ease. It is cheap, simple, and durable, is not likely to get out of order, and may be easily transported and operated.

Having thus full y described my invention, what I claim as new, and desire to secure by Letters Iatent of the United States, is-

l. As an improvement in mechanical powers, the combination, with the center bar having a pivoted cross-head at its lower end oarrying two lifting-pawls, and two'holding-pawls pivoted to the center bar above the crosshead, of two rack-bars working through the lower cross-head on the center bar and through a cross-head above theholding-pawls, and two levers for operating the pivoted cross-head and lifting-levers, substantially as specified.

2. In a mechanical power, the combination, with the center bar, pivoted cross-head, and rigid cross-head thereon, and the rack-bars, liiting-pawls, andholding-pawls, of the swinging hooks at the ends of the rigid cross-head on the center bar, for engaging the holdingpawls and keeping them out of engagement with the racks, substantially as specified.

3. In a mechanical power, the combination, with the center bar and rack-bars and thelifting and holding pawls, of the pivoted cross-head having end sockets for the reception of the removable wooden levers, substantially as specilied.

4. In a mechanical power, the combination, with the derrick, the posts of which are provided with the perforated stirrups, of the levers having clip-fulcrums, and chains provided with securing-pins connected at theirpower ends by chains to the runners of the derrick, substantially as speciied.

5. In a mechanical power, the combination, with the pivoted cross-head at the lower end of the center bar, the rigid cross-head on the center bar, and the rack-bars connected by pivoted parallel bars at their lower ends, of the hold-pawls below the rigid cross-bar and the lifting-pawls pivoted in spaces in the pivoted cross-head on opposite sides of the center bar and provided with lever-handles, substantially as specified.

6. In a mechanical power, the combination, with the center bar provided with a base, a pivoted cross-head, a rigid cross-head, and lifting-pawls and holding-pawls, of the rackbars having upper and lower pivoted crossheads, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto afixcd my signature in presence of two witnesses.

JACOB WARREN BROOKS, GEORGE WASHINGTON PLUMMER. 

